A vibration dampening device (10) including: a first section (20) having a first section support assembly (25) for supporting vibratory equipment (140); a second section 30 having a second section support assembly (35) for allowing the vibration dampening device (10) to be supported by a support apparatus (100); and one or more fluid fillable absorbers (40) located between the first and second sections (20,30), wherein the one or more fluid fillable absorbers (40) are configured to absorb at least a portion of a vibratory force transferred from operation of the vibratory equipment (140).
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1. A vibration dampening device including:
a first section having a first section support assembly which includes a first coupling to permit the vibration dampening device to be suspended via a first sling from a support apparatus;
a second section having a second section support assembly which includes a second coupling to permit vibratory machinery to be hung from the vibration dampening device via a second sling;
a plurality of fluid fillable absorbers, in fluid communication with a fluid source, located between the first and second sections for absorbing at least a portion of a vibratory force transferred from operation of the vibratory machinery, wherein the vibratory force causes displacement of the first section relative to the second section;
a displacement feedback assembly for detecting displacement between the first and second sections; and
a fluid control system, operatively connected to the displacement feedback assembly and in fluid communication with the plurality of fluid fillable absorbers, wherein the displacement feedback assembly is configured to actuate the fluid control system to control and allow the flow of fluid to the plurality of absorbers in response to detection of the displacement of the first section toward the second section due to the vibratory force and to control and allow the flow of fluid from the plurality of fluid fillable absorbers in response to detection of the displacement of the first section away from the second section due to the vibratory force, wherein at least one of:
at least some of the plurality of fluid fillable absorbers fill with fluid at different filling rates substantially simultaneously; and
at least some of the plurality of fluid fillable absorbers expel fluid at different expelling rates substantially simultaneously.
20. A vibration dampening device including:
a first section having a first section support assembly which includes a first coupling to permit the vibration dampening device to be suspended via a first sling from a support apparatus;
a second section having a second section support assembly which includes a second coupling to permit vibratory machinery to be hung from the vibration dampening device via a second sling;
one or more fluid fillable absorbers, in fluid communication with a fluid source, located between the first and second sections for absorbing at least a portion of a vibratory force transferred from operation of the vibratory machinery, wherein the vibratory force causes displacement of the first section relative to the second section;
a displacement feedback assembly for detecting displacement between the first and second sections; and
a fluid control system, operatively connected to the displacement feedback assembly and in fluid communication with the one or more fluid fillable absorbers, wherein the displacement feedback assembly is configured to actuate the fluid control system to control and allow the flow of fluid to the one or more fluid fillable absorbers in response to detection of the displacement of the first section toward the second section due to the vibratory force and to control and allow the flow of fluid from the one or more fluid fillable absorbers in response to detection of the displacement of the first section away from the second section due to the vibratory force, and wherein the fluid control system includes a directional control valve unit:
wherein the displacement feedback assembly includes an arm member, a first leveller and a second leveller, wherein the first leveller is operatively coupled to the arm member and the fluid source, wherein the first leveller is actuated by movement of the arm member in response to the second section being displaced toward the first section, wherein actuation of the first leveller causes the fluid control system to control supply of fluid to the one or more fluid fillable absorbers, and wherein the second leveller is operatively coupled to the arm member and the fluid source, wherein the second leveller is actuated by movement of the arm member in response to the second section being displaced away from the first section, wherein actuation of the second leveller causes the fluid control system to control expulsion of fluid from the one or more fluid fillable absorbers.
2. The vibration dampening device according to
3. The vibration dampening device according to
4. The vibration dampening device according to
5. The vibration dampening device according to
6. The vibration dampening device according to
7. The vibration dampening device according to
8. The vibration dampening device according to
9. The vibration dampening device according to
10. The vibration dampening device according to
11. The vibration dampening device according to
the fluid source; and
an exhaust assembly.
12. The vibration dampening device according to
13. The vibration dampening device according to
14. The vibration dampening device according to
15. The vibration dampening device according to
16. The vibration dampening device according to
17. The vibration dampening device according to
18. The vibration dampening device according to
19. The vibration dampening device according to
21. The vibration dampening device according to
a first port in fluid communication with the first leveller;
a second port in fluid communication with the second leveller;
a third port in fluid communication with the fluid source;
a fourth port in fluid communication with the plurality of fluid fillable absorbers; and
a fifth port in fluid communication with one of:
the exhaust assembly; and
the fluid source via a one way valve.
22. The vibration dampening device according to
in the event that the first port is actuated via actuation of the first leveller, the third and fourth ports are actuated by the directional control valve unit to allow fluid to be supplied from the fluid source to the one or more fluid fillable absorbers; and
in the event that the second port is actuated via actuation of the second leveller, the fourth and fifth ports are actuated by the directional control valve to allow fluid to be expelled from the one or more fluid fillable absorbers.
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The present invention relates to a vibration dampening device.
A common technique for installing sheet elongate members such as piles, anchor members, caissons, and mandrels is to use a vibratory machine, such as a pile driver or vibratory hammer, supported by a support apparatus, such as a crane or the like. In the instance of a pile driver, one end of the vibratory pile driver is supported by the crane, such as via the hook connected to a sling, and the other end of the vibratory pile driver drives against the piling to thereby drive the pile into a ground surface.
Generally, the vibratory pile driver can include a set of eccentric weights, such as cams, which are rotated at high speed to cause the vibratory pile driver to vibrate. The vibratory force created by the vibratory pile driver is then transferred against the end of the pile to thereby drive the pile into the ground surface.
During start-up and shutdown phases of such vibrating equipment, there is generally a considerable amount of vibratory force that transferred to the support apparatus, such as the crane, via the sling. In particular situations, the vibratory force transferred to the crane can lead to a, number of failures. This can include boom failure, excessive wear and tear to major structural components such as pins, sheaves, track gear, and acceleration of structural and metal weld fatigue. These failures can therefore drastically reduce the lifetime of the machines.
Whilst a number of dampening devices have been proposed in the past, these devices generally use elastomeric material to absorb a portion of the vibratory force. However, due to shear strain that is applied to the elastomeric material, these components of these device wear. Furthermore, depending upon the vibratory force that is being transferred, dampening properties of the elastomeric material cannot be altered according to operating conditions.
Therefore, there is a need for a vibration dampening device that overcomes or at least alleviates one or more of the above-mentioned problems, or at least provides a useful commercial alternative.
The reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as, an acknowledgement or admission or any form of suggestion that that prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of endeavour to which this specification relates.
In one broad aspect there is provided a vibration dampening device including:
In one form, the vibratory force transferred to the first section causes the first section to displace toward the second section, wherein the displacement of the first section toward the second section causes the one or more fluid fillable absorbers to compress, thereby at least partially absorbing the vibratory force.
In another form, a portion of the first section support assembly protrudes through one or more second section apertures in the second section, and a portion of the second support assembly protrudes through one or more first section apertures in the first section.
In one embodiment, the portion of the first section support assembly which protrudes through the second section aperture is one or more first section support arms, and the portion of the second section support assembly which protrudes through the first section aperture is one or more second section support arms.
In another embodiment, a first section coupling element is coupled to the one or more first section support arms for coupling the vibratory equipment to vibration dampening device.
In an optional form, a second section coupling element is coupled to the one or more second section support arms for coupling the support apparatus to the vibration dampening device.
In another optional form, the first section includes a first section plate and the second section includes a second section plate, the first and second section plates being respectively parallel and separated by the one or more fluid fillable absorbers.
Optionally, the first section plate and the second section plate respectively include upper and lower rigid sheets.
In one form, the first section plate and the second section plate respectively include an embedded rigid sheet.
In another form, at least one of the first section plate and the second section plate are made substantially from a polymer material.
In one embodiment, the polymer material is polyethylene.
In another embodiment, the one or more fluid fillable absorbers includes an inlet for receiving fluid from a fluid source and an outlet for expelling fluid.
In an optional form, the vibration dampening device includes a fluid control system in fluid communication with the one or more fluid fillable absorbers, wherein the fluid control system is configured to control at least one of the flow of fluid to and from the one or more fluid fillable absorbers.
In another optional form, the fluid expelled from the one or more fluid fillable absorbers is transferred to at least one of:
In an optional embodiment, the vibration dampening device includes a displacement feedback assembly, operatively connected to the fluid control system, for detecting displacement between the first and second sections, wherein the fluid control system is activated upon the displacement feedback assembly detecting displacement.
In another optional embodiment, in the event that the displacement feedback system detects displacement of the second section toward the first section, the fluid control system supplies fluid to the one or more fluid fillable absorbers.
Optionally, in the event that the displacement feedback assembly displacement of the second section toward the first section, the fluid control system expels fluid from the one or more fluid fillable absorbers.
Optionally, the displacement feedback assembly includes:
In one form, the fluid control system includes a directional control valve unit including:
In another form:
In one embodiment, the fluid source is a pressurised gas source, wherein the fluid fillable absorbers are inflatable with pressurised gas.
In another embodiment, the pressurised gas source is a compressed air source.
In an optional form, the one or more fluid fillable absorbers are air bags.
In another optional form, each air bag includes a rolling-lobe and piston configuration.
In one embodiment, the fluid source is a hydraulic fluid source.
In another embodiment, the vibration dampening device includes a plurality of fluid fillable absorbers, wherein a first fluid communication line and a second fluid communication line provide fluid from the fluid source to respective portions of the fluid fillable absorbers at different fluid rates.
In an optional form, the vibration dampening device includes a motor operatively connected to a compressor, wherein the compressor is operatively connected to the fluid supply.
In another optional form, the vibration dampening device includes a receiver unit operatively connected to the motor, wherein the receiver unit is responsive to a remote control unit to control the operation of the motor.
Optionally, the first section includes first walls that extend toward the second section, and the second section includes second walls that extend toward the first section, wherein the first and second walls undergo telescopic movement relative to each other when vibratory force is being partially absorbed by the vibration dampening device.
Other embodiments will be described throughout the description of the example embodiments.
Example embodiments should become apparent from the following description, which is given by way of example only, of at least one preferred but non-limiting embodiment, described in connection with the accompanying figures.
The following modes, given by way of example only, are described in order to provide a more precise understanding of the subject matter of a preferred embodiment or embodiments. In the figures, incorporated to illustrate features of an example embodiment, like reference numerals are used to identify like parts throughout the figures.
Referring to
Advantageously, the vibration dampening device 10 intercepts and dampens vibratory forces via the compression of the one or more fluid fillable absorbers 40. This configuration is particularly successful at startup and shut down phases of operation of the vibratory equipment 140 where low-frequency vibratory forces are a significant proportion of the vibratory force transferred to the support apparatus 100. Furthermore, the vibratory force that is transferred to the support apparatus 140 during startup and shut down phases of operation of the vibratory equipment 140 is generally significantly greater than during normal operation. Thus, violent shaking of the support apparatus 100 is reduced during these phases utilising the vibration dampening device 10.
As shown in
In use, the first and second sections 20, 30 are urged toward each other when a downward force is applied to the first section support assembly 25 via a lower sling 130. As the first and second sections 20, 30 are urged together, the first and second sections displace toward each other, thereby causing the one or more fluid fillable absorbers 40 to compress and at least partially absorb the vibratory force. The partial absorption of the urging force by the one or more fluid fillable absorbers 40 reduces the vibratory force transferred to the support apparatus 100 via an upper sling 120.
Referring more specifically to
The first section support assembly 25 can include a plurality of first section support arm 50 that are connected to the first section 20 and extend downwardly therefrom. The first section support arm 50 are located radially about the first section aperture and are spatially distributed evenly. A portion of each first section support arm 50 protrudes through a respective one of the second section apertures 60 provided in the second section plate 21. Each second section aperture 60 may include a substantially frictionless bush 37 on the inner surface thereof, such as a Teflon insert, to reduce friction between the first section support arms 50 and the second section plate 31 during operation.
The protruded portions of the first section support arms 50 connect to a stop member 70 which rests under the second section plate 31 to restrict the second section 30 and the first section 20 separating via withdrawal of the first section support arms 50 from the second section plate 31. The stop member 70 may be releasably attached to the first section support arms 50 via coupling elements. For example, each first section support arm 50 may includes a screw thread to allow for threaded element to be coupled thereto. The stop member may be a coupling plate 70 which is releasably secured under the second section plate 31. Alternatively, it will be appreciated the first section support arms 50 can be fixed permanently to the stop member 70.
The first section support assembly 25 includes a first section coupling element 26 for coupling the lower sling 130 to the first section support assembly 25. In particular, the first section coupling element 26 is provided in the form of a lug or eyelet which can extend from the stop member 70.
The second support assembly 35 includes a second support arm 55 that is centrally located on the second section plate 31 and extends substantially perpendicularly therefrom. Whilst the second section support arm 35 is shown for clarity purposes having a beam-like profile in
A portion of the second section support arm 55 protrudes through the first section aperture 65 located centrally in the first section plate 20. The second support assembly 35 includes a second section coupling element 80 for coupling the upper sling 120 to the second section support assembly 35. The second section coupling element 80 is provided in the form of a lug or eyelet which can extend from the second section support arm 55.
Whilst it is shown in
As shown in
Referring to
The fluid source 710 is preferably a gas source, such as a pressurised gas supply, wherein the fluid fillable absorbers 40 are inflatable with pressurised gas. The pressurised fluid source can be provided in the form of a pressurised fluid reservoir, such as a pressurised air tank, which can be supported on the device 10, such on an upper surface of the first section 20.
The fluid source 710 can be in fluid communication with a compressor 760 to resupply fluid to the fluid source 710 when fluid is distributed to the fluid fillable absorbers 40. The compressor may be operably connected to a motor 761, such as a diesel motor. The fluid source 710, compressor 760 and or motor 761 can be supported upon the vibration dampening device 10. Due to the device 10 being able to operate on air pressure only, the device is safe in areas where electrical systems may be hazardous. Additionally the expulsion of air is environmentally advantageous. It will be appreciated that other forms of fluid can be used such as a hydraulic liquid, however gas has been found advantageous for particular applications, particularly due to the relatively light weight of gas.
The vibration dampening device 10 can include a displacement feedback assembly 730 for detecting displacement between the first and second section plates 21, 31 and for maintaining the separation of the first and second sections 21, 31 to a particular defined spacing. The defined spacing can generally be defined as a preferred ride level of the fluid fillable absorbers 40.
The displacement feedback assembly 730 is operatively connected to the fluid source 710 to selectively supply fluid from the fluid source 710 to maintain the separation between the first and second section plates 21, 31 in the event that the first and second section plates 21, 31 are displaced toward each other. The displacement feedback assembly 730 can be also operatively connected to the exhaust assembly 720, wherein in the event that the displacement feedback assembly 730 detects that the second section plate 31 has been displaced away from the first section plate 21, the exhaust assembly 720 is actuated to allow fluid to be expelled from the one or more fluid fillable absorbers 40.
Referring to
In particular,
The displacement feedback assembly 730 can be constructed using many configurations. Referring to
The arm member 410 is operatively coupled, at a first end, to the second section plate 31. The first leveller 420 is operatively coupled to a second end of the arm member 410 and the fluid source 710, wherein the first leveller is actuable by displacement of the arm member 410 when the second section 30 is displaced toward the first section 20 as shown in
The second leveller 430 is operatively coupled to the second end of the arm member 410 and the fluid source 710, wherein the second leveller 430 is actuable by displacement of the arm member 410 when the second member 30 is displaced away from the first section, plate 21 as shown in
Referring to
The directional control valve unit 740 is configured to allow supply of fluid from the fluid source 710 to the one or more fluid fillable absorbers 40, or to expel fluid from the fluid fillable absorbers 40 via the exhaust assembly 720, based upon whether the first or second leveller 420, 430 is actuated. The directional control valve unit 740 includes a plurality of control elements associated with respective ports 746 which detect fluid being provided thereto wherein the actuation of one of the control elements 747 at a respective port 746 results in opening and/or closing one or more valves at one or more ports 746 of the directional control valve unit 740.
In the event that the control element 747 at the first port 741 is actuated via fluid supply from actuation of the first leveller 420, the directional control valve unit 740 actuates valves at the third and fourth port 743, 744, allowing fluid to be supplied from the fluid source 710 to the one or more fluid fillable absorbers 40.
Alternatively, in the event that the control element 747 at the second port 742 is actuated via fluid supply from actuation of the second leveller 430, the directional control valve unit 740 actuates valves at the fourth and fifth ports 744, 745, allowing fluid to be expelled from the fluid fillable absorbers 40 via the exhaust assembly 720.
As shown in
It will be appreciated that the displacement feedback assembly 730 described above is a mechanical type arrangement which is advantageous due to the type of vibrational forces that are being exerted on the device. Whilst the displacement feedback assembly 730 described above is based on a mechanical arrangement to detect displacement between the first and second section plates 21, 31, other arrangements can be utilised.
In particular, one or more electronic sensors (not shown), such as a laser or an ultrasonic sensor, can be used to detect displacement of the first section plate 21 toward or away from the second section plate 31. The one or more electronic sensors can be used as input to an electromechanical directional control valve, wherein depending upon the electrical input from the one or more electronic sensors indicative of the displacement of the first section plate 21 toward or away from the second section plate 31 relative to a displacement threshold, the supply of fluid or expulsion of fluid is actuated by the electromechanical directional control valve. Other arrangements for the displacement feedback assembly 730 are also possible.
Referring to
When fluid is expelled from the air bags 40, the air bags 40 allow the first and second section plates 21, 31 to move toward each other, as shown in
In one optional embodiment 800 as shown in
The holding tank 810 includes a pair of one-way valves to restrict fluid flowing in from the fluid source 710 and fluid flowing out to the fluid fillable absorbers 40. The holding tank 810 may pressurise the fluid which flows into the holding tank 810 prior to transferring the pressurised fluid back to the fluid source 710 for resupply to the fluid fillable absorbers 40 when required. This optional embodiment 800 thereby reduces the expulsion of fluid to the external environment. In the event that temperature of the environment lowers, the fluid source 710 may need to be topped up with further fluid to adequately provide a sufficient amount of fluid pressure to the one or more fluid fillable absorbers 40. In the event that the temperature of the environment increases, there may be an increase in the fluid pressure in the system 810, wherein a blow-off valve (not shown) may be automatically actuated to expel fluid from the holding tank, fluid source 710, or the exhaust assembly 720.
The device 10 can include a casing 1200 as shown in
Referring more specifically to
In an alternative, the casing may be provided in the form of a baffle, in particular a concertinaed baffle, which extends between the edges of the first and second section plates 21, 31 to surround the sides of the device 10.
In a preferable form, a substantially constant fluid pressure is to be provided by the fluid source 710 when actuated to supply fluid to the fluid fillable absorbers 40. A selectable control valve may be provided with the fluid source 710 to selectively adjust and control the fluid supplied to the fluid fillable absorbers 40. In one form, the fluid source 710 is provided between a pressure range of 90 psi to 110 psi, and more preferably 100 psi. When fluid is provided to the fluid fillable absorbers 40, the fluid source 710 increases the volume of fluid provided in the fluid fillable absorbers 40 at a constant pressure until the displacement feedback assembly detects that the displacement between the first and second section plates 21, 31 is satisfactory.
As shown in
In another variation, the vibration dampening device 10 can also include one or more mechanical vibration absorbers. In particular, referring to
In another variation, the fluid source 710 may be provided in the form of a compressor of the support apparatus 100. In particular, a number of support apparatuses 100 such as cranes and excavators include a hydraulic compressor that can be fluidly connected to the device 10 to at least partially fill the one or more fluid finable absorbers 40.
In a further variation, the vibration absorbing device 10 may be integrated within vibratory equipment 140. In this configuration, the vibration absorbing device 10 is integral with the vibratory equipment 140, thereby reducing the need for two separate pieces of equipment.
In a further variation, whilst the first and second sections 20, 30 can be made of steel, a polymer material can also be used to lighten the device 10. In particular, the polymer material can have a low coefficient of friction, such as Teflon. Not only is the device lighter, but advantageously due to the low coefficient of friction of the material which the first and second section is made of the need for substantially frictionless inserts for reducing the friction between the first and second support arms 50, 55 with the second and first section plates 21, 31 is not required.
In another variation, the vibration dampening device 10 can operate using a liquid rather than a gas, such hydraulic fluid. The air bags of the previous described embodiments may be substituted for a plurality of hydraulic vibration absorbers which are in fluid communication with a hydraulic accumulator, such as a pulse hydraulic accumulator.
As shown in
Referring to
The first and second section plates 21, 31 are made from a polymer. In particular, the polymer is ultra high density polyethylene. The first section 20 includes an upper and lower rigid sheet 1040A, 1040B which is generally made from steel or similarly rigid material to provide additional strength. The polymer material of the first section plate 21 is sandwiched between the upper and lower sheets 1040A, 1040B.
Similarly, the second section plate includes an upper and lower sheet 1040C, 1040D. The second section 30 includes an upper and lower sheet 1040C, 1040D which is generally made from steel or similar to provide additional strength. The polymer second section plate 31 is sandwiched between the upper and lower plates 1040C, 1040D.
The first and second section 20, 30 in this example include no welded joints, but rather a number of keyed arrangements in order to reduce failures to welded components when under significant load.
In particular, referring to the exploded view in
Similarly, referring to the exploded view in
As shown in
Similarly, as shown in
In another variation, the vibration dampening device 10 can include a battery source 716 electrically connected to a heat source 715. The heat source 715 can be selectively activated to thermally heat the fluid supply 710 due to changes in environmental temperature which can effect pressure within the plumbing arrangement of the vibration dampening device 10. The vibration dampening device 10 may include a thermometer to measure the environmental temperature, wherein in the event that the temperature is below a threshold temperature, the heat source 715 is activated.
In another variation, the vibration dampening device 10 includes a remote control unit 763 and a receiver unit 762. The receiver unit 762 is operatively coupled to the motor 761. The remote control unit 763 can be operated by a user thereby controlling the operation of the vibration dampening device 10. In one form, the remote control unit 763 includes an interface to activate the motor 761, wherein the remote control unit 763 generates and emits a radio signal indicative of an activation command. The receiver unit 762 receives the radio signal indicative of the activation command, and in response activates the motor 761. The activation of the motor 761 thereby activates the compressor 760, thereby activating the supply of fluid to the fluid fillable absorbers 40. The remote control unit 763 can also include an interface to deactivate the motor 761, wherein the remote control unit 763 generates and emits a radio signal indicative of a deactivation command. The receiver unit 762 receives the radio signal indicative of the deactivation command, and in response deactivates the motor 761, thereby deactivating the compressor 760 and the supply of fluid to the fluid fillable absorbers 40. The fluid control system 740 may also expel the fluid contained in the fluid fillable absorbers in response to the deactivation signal being received by the receiver unit 762.
In another variation, a rigid sheet 1099, such as a steel sheet, may be embedded within the polymer plate of the first and second section plates 21, 31. The embedded rigid sheet 1099 may be embedded during the manufacturing process of the polymer plates 21, 31. The embedded rigid sheet may have apertures cut therein prior to embedding in the plates, wherein the apertures correspond to apertures of the first and second plates.
Many modifications will be apparent to those skilled in the art without departing from the scope of the present invention.
Patent | Priority | Assignee | Title |
Patent | Priority | Assignee | Title |
3116045, | |||
3120382, | |||
3828864, | |||
3920083, | |||
4972930, | Dec 26 1989 | The Boeing Company | Dynamically adjustable rotary unbalance shaker |
5117925, | Jan 12 1990 | AMERICAN PILEDRIVING EQUIPMENT, INC | Shock absorbing apparatus and method for a vibratory pile driving machine |
5390121, | Aug 19 1993 | Lord Corporation | Banded on-off control method for semi-active dampers |
5582385, | Apr 27 1995 | CAMP, INC | Method for controlling motion using an adjustable damper |
5652704, | Sep 12 1995 | Lord Corporation | Controllable seat damper system and control method therefor |
7080958, | Apr 27 2005 | International Construction Equipment, Inc. | Vibratory pile driver/extractor with two-stage vibration/tension load suppressor |
7185592, | Dec 22 2003 | KNORR-BREMSE SYSTEME FUR SCHIENENFAHRZEUGE GMBH | System for the secondary suspension of a superstructure of a rail vehicle having a passive spring element |
20050082127, | |||
20070045067, | |||
CN101856961, | |||
DE3145071, | |||
DE4447156, | |||
EP767320, | |||
FR1263909, | |||
JP2157316, | |||
JP4258550, |
Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Sep 17 2010 | TIGHE, PETER JOHN | NEGA-SHOCK PTY LIMITED | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 030874 | /0984 | |
Feb 09 2011 | A.C.N. 166 970 627 PTY LTD | (assignment on the face of the patent) | / | |||
Jun 26 2014 | NEGA-SHOCK PTY LIMITED | A C N 166 970 627 PTY LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 033338 | /0134 |
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